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First, there is no human clinical trial of AHK-Cu by any route injectable or topical and the entire peer-reviewed evidence specific to this peptide is a single 2007 study that was ex vivo (isolated human hair follicles) and in vitro (cultured dermal-papilla cells) [1]

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Human-skin penetration research provides additional topical-delivery context [5]

Patients who combine the peptide with a comprehensive approach to health typically see the best outcomes

This regulatory limbo creates a side-effect risk that has nothing to do with the molecules themselves: product quality variation